semantic-ui-react-scrollbar/lib/Scrollbar.js

Horizontal and vertical scroll bar for Semantic UI React

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var React = _interopRequireWildcard(require("react"));

var _propTypes = _interopRequireDefault(require("prop-types"));

var _semanticUiReact = require("semantic-ui-react");

var _styles = _interopRequireDefault(require("./styles"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(source, true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(source).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }

function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

var Scrollbar =
/*#__PURE__*/
function (_React$Component) {
  _inherits(Scrollbar, _React$Component);

  function Scrollbar(props) {
    var _this;

    _classCallCheck(this, Scrollbar);

    _this = _possibleConstructorReturn(this, _getPrototypeOf(Scrollbar).call(this, props));

    _defineProperty(_assertThisInitialized(_this), "state", {
      currentScrollPosition: 0
    });

    _defineProperty(_assertThisInitialized(_this), "scrollbarRef", void 0);

    _defineProperty(_assertThisInitialized(_this), "trackRef", void 0);

    _defineProperty(_assertThisInitialized(_this), "thumbRef", void 0);

    _defineProperty(_assertThisInitialized(_this), "trackWidth", void 0);

    _defineProperty(_assertThisInitialized(_this), "trackLeft", void 0);

    _defineProperty(_assertThisInitialized(_this), "thumbWidth", void 0);

    _defineProperty(_assertThisInitialized(_this), "trackHeight", void 0);

    _defineProperty(_assertThisInitialized(_this), "trackTop", void 0);

    _defineProperty(_assertThisInitialized(_this), "thumbHeight", void 0);

    _defineProperty(_assertThisInitialized(_this), "onKeyDown", function (keyboardEvent) {
      var _this$props = _this.props,
          allowArrowKeys = _this$props.allowArrowKeys,
          allowCtrlOrMetaArrowKeys = _this$props.allowCtrlOrMetaArrowKeys,
          allowHomeAndEndKeys = _this$props.allowHomeAndEndKeys,
          changeScrollPosition = _this$props.changeScrollPosition,
          maxScrollPosition = _this$props.maxScrollPosition,
          orientation = _this$props.orientation,
          pageSize = _this$props.pageSize;
      var isKeyHandled = false;

      if (window.getComputedStyle(_this.scrollbarRef.current).getPropertyValue('visibility') === 'visible') {
        if (!keyboardEvent.ctrlKey && !keyboardEvent.metaKey && allowArrowKeys && (orientation === 'horizontal' && keyboardEvent.code === 'ArrowLeft' || orientation === 'vertical' && keyboardEvent.code === 'ArrowUp')) {
          _this.scrollLeftOrUp();

          isKeyHandled = true;
        } else if (!keyboardEvent.ctrlKey && !keyboardEvent.metaKey && allowArrowKeys && (orientation === 'horizontal' && keyboardEvent.code === 'ArrowRight' || orientation === 'vertical' && keyboardEvent.code === 'ArrowDown')) {
          _this.scrollRightOrDown();

          isKeyHandled = true;
        } else if (allowHomeAndEndKeys && keyboardEvent.code === 'Home') {
          _this.setState({
            currentScrollPosition: 0
          });

          changeScrollPosition(0);
          isKeyHandled = true;
        } else if (allowHomeAndEndKeys && keyboardEvent.code === 'End') {
          _this.setState({
            currentScrollPosition: maxScrollPosition
          });

          changeScrollPosition(maxScrollPosition);
          isKeyHandled = true;
        } else if (allowCtrlOrMetaArrowKeys && (keyboardEvent.ctrlKey || keyboardEvent.metaKey) && (orientation === 'horizontal' && keyboardEvent.code === 'ArrowLeft' || orientation === 'vertical' && keyboardEvent.code === 'ArrowUp')) {
          _this.setState(function (_ref) {
            var currentScrollPosition = _ref.currentScrollPosition;

            if (currentScrollPosition - pageSize >= 0) {
              changeScrollPosition(currentScrollPosition - pageSize);
              return {
                currentScrollPosition: currentScrollPosition - pageSize
              };
            }

            changeScrollPosition(0);
            return {
              currentScrollPosition: 0
            };
          });

          isKeyHandled = true;
        } else if (allowCtrlOrMetaArrowKeys && (keyboardEvent.ctrlKey || keyboardEvent.metaKey) && (orientation === 'horizontal' && keyboardEvent.code === 'ArrowRight' || orientation === 'vertical' && keyboardEvent.code === 'ArrowDown')) {
          _this.setState(function (_ref2) {
            var currentScrollPosition = _ref2.currentScrollPosition;

            if (currentScrollPosition + pageSize <= maxScrollPosition) {
              changeScrollPosition(currentScrollPosition + pageSize);
              return {
                currentScrollPosition: currentScrollPosition + pageSize
              };
            }

            changeScrollPosition(maxScrollPosition);
            return {
              currentScrollPosition: maxScrollPosition
            };
          });

          isKeyHandled = true;
        }
      }

      if (isKeyHandled) {
        keyboardEvent.preventDefault();
        keyboardEvent.stopPropagation();
      }
    });

    _defineProperty(_assertThisInitialized(_this), "updateThumbPosition", function (event) {
      event.stopPropagation();
      var _this$props2 = _this.props,
          changeScrollPosition = _this$props2.changeScrollPosition,
          maxScrollPosition = _this$props2.maxScrollPosition,
          orientation = _this$props2.orientation;
      var currentScrollPosition;

      if (orientation === 'horizontal') {
        currentScrollPosition = Math.round((event.pageX - _this.trackLeft - _this.thumbWidth / 2) / (_this.trackWidth - _this.thumbWidth) * maxScrollPosition);
      } else {
        currentScrollPosition = Math.round((event.pageY - _this.trackTop - _this.thumbHeight / 2) / (_this.trackHeight - _this.thumbHeight) * maxScrollPosition);
      }

      currentScrollPosition = Math.min(maxScrollPosition, Math.max(0, currentScrollPosition));

      _this.setState({
        currentScrollPosition: currentScrollPosition
      });

      changeScrollPosition(currentScrollPosition);
    });

    _defineProperty(_assertThisInitialized(_this), "endThumbDrag", function (event) {
      event.stopPropagation();
      window.removeEventListener('mousemove', _this.updateThumbPosition);
      window.removeEventListener('mouseup', _this.endThumbDrag);
    });

    _defineProperty(_assertThisInitialized(_this), "startThumbDrag", function (event) {
      event.stopPropagation();
      window.addEventListener('mousemove', _this.updateThumbPosition);
      window.addEventListener('mouseup', _this.endThumbDrag);
    });

    _defineProperty(_assertThisInitialized(_this), "scrollLeftOrUp", function (event) {
      var changeScrollPosition = _this.props.changeScrollPosition;

      if (event) {
        event.stopPropagation();
      }

      _this.setState(function (_ref3) {
        var currentScrollPosition = _ref3.currentScrollPosition;

        if (currentScrollPosition > 0) {
          changeScrollPosition(currentScrollPosition - 1);
          return {
            currentScrollPosition: currentScrollPosition - 1
          };
        }

        return {
          currentScrollPosition: currentScrollPosition
        };
      });
    });

    _defineProperty(_assertThisInitialized(_this), "scrollRightOrDown", function (event) {
      var _this$props3 = _this.props,
          maxScrollPosition = _this$props3.maxScrollPosition,
          changeScrollPosition = _this$props3.changeScrollPosition;

      if (event) {
        event.stopPropagation();
      }

      _this.setState(function (_ref4) {
        var currentScrollPosition = _ref4.currentScrollPosition;

        if (currentScrollPosition < maxScrollPosition) {
          changeScrollPosition(currentScrollPosition + 1);
          return {
            currentScrollPosition: currentScrollPosition + 1
          };
        }

        return {
          currentScrollPosition: currentScrollPosition
        };
      });
    });

    _this.scrollbarRef = React.createRef();
    _this.trackRef = React.createRef();
    _this.thumbRef = React.createRef();
    _this.trackWidth = 0;
    _this.trackLeft = 0;
    _this.thumbWidth = 0;
    _this.trackHeight = 0;
    _this.trackTop = 0;
    _this.thumbHeight = 0;
    return _this;
  }

  _createClass(Scrollbar, [{
    key: "componentDidMount",
    value: function componentDidMount() {
      this.trackWidth = this.trackRef.current.offsetWidth;
      this.trackLeft = this.trackRef.current.getBoundingClientRect().left;
      this.thumbWidth = this.thumbRef.current.offsetWidth;
      this.trackHeight = this.trackRef.current.offsetHeight;
      this.trackTop = this.trackRef.current.getBoundingClientRect().top;
      this.thumbHeight = this.thumbRef.current.offsetHeight;
      document.addEventListener('keydown', this.onKeyDown);
    }
  }, {
    key: "componentWillUnmount",
    value: function componentWillUnmount() {
      document.removeEventListener('keydown', this.onKeyDown);
    }
  }, {
    key: "render",
    value: function render() {
      var _this$props4 = this.props,
          className = _this$props4.className,
          maxScrollPosition = _this$props4.maxScrollPosition,
          orientation = _this$props4.orientation;
      var currentScrollPosition = this.state.currentScrollPosition;
      var marginLeft = 0;
      var marginTop = 0;

      if (orientation === 'horizontal') {
        marginLeft = "".concat(this.trackWidth ? currentScrollPosition * (this.trackWidth - this.thumbWidth) / maxScrollPosition : 0, "px");
      } else {
        marginTop = "".concat(this.trackHeight ? currentScrollPosition * (this.trackHeight - this.thumbHeight) / maxScrollPosition : 0, "px");
      }

      var thumbStyle = _objectSpread({}, _styles.default.thumb, {
        marginLeft: marginLeft,
        marginTop: marginTop
      });

      return React.createElement("div", {
        className: className,
        ref: this.scrollbarRef,
        style: _styles.default.scrollbar[orientation]
      }, React.createElement("div", {
        className: "button",
        style: _styles.default.button,
        onClick: this.scrollLeftOrUp
      }, React.createElement(_semanticUiReact.Icon, {
        name: orientation === 'horizontal' ? 'caret left' : 'caret up',
        style: {
          margin: 0
        }
      })), React.createElement("div", {
        className: "track",
        style: _styles.default.track[orientation],
        ref: this.trackRef,
        onClick: this.updateThumbPosition
      }, React.createElement("div", {
        className: "thumb",
        style: thumbStyle,
        ref: this.thumbRef,
        onMouseDown: this.startThumbDrag
      })), React.createElement("div", {
        className: "button",
        style: _styles.default.button,
        onClick: this.scrollRightOrDown
      }, React.createElement(_semanticUiReact.Icon, {
        name: orientation === 'horizontal' ? 'caret right' : 'caret down',
        style: {
          margin: 0
        }
      })));
    }
  }]);

  return Scrollbar;
}(React.Component);

exports.default = Scrollbar;

_defineProperty(Scrollbar, "propTypes", {
  allowArrowKeys: _propTypes.default.bool,
  allowCtrlOrMetaArrowKeys: _propTypes.default.bool,
  allowHomeAndEndKeys: _propTypes.default.bool,
  changeScrollPosition: _propTypes.default.func.isRequired,
  className: _propTypes.default.string,
  maxScrollPosition: _propTypes.default.number.isRequired,
  orientation: _propTypes.default.oneOf(['horizontal', 'vertical']),
  pageSize: _propTypes.default.number
});

_defineProperty(Scrollbar, "defaultProps", {
  allowArrowKeys: true,
  allowCtrlOrMetaArrowKeys: false,
  allowHomeAndEndKeys: false,
  className: undefined,
  orientation: 'horizontal',
  pageSize: 1
});
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